Title :
Impulse waveform effects on negative point voltage/time characteristics in gamma irradiated SF6
Author :
Thalji, J.Y. ; Nelson, J.K.
Author_Institution :
Dept. of Electr. Power Eng., Rensselaer Polytech. Inst., Troy, NY, USA
Abstract :
Comparative time lag measurements were conducted for a point-to-plane geometry at 0.1 and 0.2 MPa using both steep-fronted impulses and lightning surges over the time scale 10 ns to 1 ms. The time scale over which breakdown occurs under low overvoltages was found to be the most basic difference between the two responses. Statistical analysis of the terminal measurements revealed a transition in the distribution of failure times from one population to another. The transition was pressure and waveform dependent. Corona stabilization was shown to generate a distinct anomaly in the voltage/time curve for the lightning surge which was not mirrored in the characteristics generated under the steep-fronted impulse application. Fast rising surges did not cause anomalous behavior in the voltage/time characteristics over the nanosecond region, and were not inducive to stabilization like long-fronted impulses
Keywords :
corona; electric breakdown of gases; gamma-ray effects; gaseous insulation; impulse testing; insulation testing; sulphur compounds; transients; 0.1 MPa; 0.2 MPa; 10 ns to 1 ms; breakdown; corona stabilisation; distribution of failure times; gamma irradiated SF6; gas insulation; impulse waveform effects; lightning surges; negative point voltage/time characteristics; point-to-plane geometry; steep-fronted impulses; time lag measurements; Breakdown voltage; Character generation; Corona; Electric breakdown; Geometry; Lightning; Statistical analysis; Surges; Tail; Time measurement;
Conference_Titel :
Electrical Insulation, Conference Record of the 1992 IEEE International Symposium on
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-0649-X
DOI :
10.1109/ELINSL.1992.246993